2006 Mercedes-Benz CLS55 AMG

The 2006 Mercedes-Benz CLS55 AMG is a high-performance sedan that blends luxury with impressive power. While it came standard with the 5.5L Supercharged V8 engine, offering a staggering 469 horsepower and 516 lb-ft of torque, the CLS lineup did have other engine options for the non-AMG models. The CLS55 AMG was only available with the 5-speed automatic transmission. Owners appreciate the car’s distinctive coupe-like styling, powerful engine, and comfortable ride. However, some common complaints include higher maintenance costs associated with the AMG model and the complexity of the vehicle’s electronics.

Engine

5.5L Supercharged V8 (M113K)

• Intercooler Pump Failure
  • Description/Symptoms: The intercooler pump circulates coolant through the intercooler to cool the intake air charge. A failing pump leads to reduced supercharger efficiency and a noticeable loss of power, especially in hot weather. Can cause the car to go into limp mode.
  • Solution: Replace the intercooler pump with an updated or aftermarket version.
  • Estimated Cost to Fix: $200 - $500+ depending on pump and labor
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks from the valve cover gaskets, often dripping onto the exhaust manifold and causing a burning smell.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $300 - $600
• Supercharger Clutch Failure
  • Description/Symptoms: The supercharger clutch engages and disengages the supercharger based on demand. Failure leads to loss of supercharger boost and a significant reduction in power. A distinct rattling or grinding noise may be heard.
  • Solution: Replace the supercharger clutch assembly.
  • Estimated Cost to Fix: $1000 - $2000+
• Crankshaft Position Sensor Failure
  • Description/Symptoms: Engine stalling, rough running, or failure to start.
  • Solution: Replace the crankshaft position sensor.
  • Estimated Cost to Fix: $150 - $300
• Recalls: None Found

Transmission

5-Speed Automatic (722.6)

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, getting stuck in gear, or failure to shift. Can cause limp mode. Often accompanied by diagnostic trouble codes (DTCs) related to transmission solenoids.
  • Solution: Replace the conductor plate and filter.
  • Estimated Cost to Fix: $500 - $1000
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration at low speeds, especially during acceleration. Can also cause slipping and poor fuel economy.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $1200 - $2500 *Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: The Airmatic suspension system is prone to leaks and failures. Symptoms include the car sitting unevenly, sagging, or not raising when selected. May also trigger warning lights on the dashboard.
  • Solution: Diagnose and replace the leaking components (air springs, air struts, compressor, valve block).
  • Estimated Cost to Fix: $500 - $2000+ per corner, depending on the component. Airmatic compressor $500 - $1000 *Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Rapid battery drain, especially when the car is not in use. Can be caused by a faulty voltage regulator, a malfunctioning module, or a parasitic draw.
  • Solution: Diagnose the source of the drain and repair or replace the faulty component.
  • Estimated Cost to Fix: $100 - $500+ depending on the cause.
• Instrument Cluster Issues
  • Description/Symptoms: Pixel loss, dimming, or complete failure of the instrument cluster display.
  • Solution: Repair or replace the instrument cluster.
  • Estimated Cost to Fix: $300 - $1000+
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Various electrical malfunctions, such as malfunctioning lights, wipers, or power windows.
  • Solution: Replace the faulty SAM unit.
  • Estimated Cost to Fix: $500 - $1200+ *Recalls: None Found

Exterior

• Rust (Limited)
  • Description/Symptoms: Rust can occur in areas prone to moisture, such as around wheel wells and underbody.
  • Solution: Repair or replace affected panels.
  • Estimated Cost to Fix: Varies greatly depending on the severity.
• Headlight Condensation
  • Description/Symptoms: Moisture buildup inside the headlight housings.
  • Solution: Reseal the headlight housings or replace the headlights.
  • Estimated Cost to Fix: $100 - $500+ *Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof may become stuck, make excessive noise, or leak.
  • Solution: Repair or replace the sunroof mechanism.
  • Estimated Cost to Fix: $300 - $1000+
• Navigation System Issues
  • Description/Symptoms: The navigation system may become outdated, malfunction, or display error messages.
  • Solution: Update the navigation software or replace the navigation unit.
  • Estimated Cost to Fix: $100 - $1000+ *Recalls: None Found

Summary:

The 2006 Mercedes-Benz CLS55 AMG is a powerful and luxurious car, but it comes with potential maintenance concerns. The most significant and costly issues revolve around the Airmatic suspension, supercharger, and transmission. Electrical problems related to the SAM modules and battery drain are also relatively common. While some issues are minor, others can be quite expensive to repair, making a pre-purchase inspection by a qualified Mercedes-Benz mechanic essential.